Malicious PDF — malware analysis report

Static analysis result for SHA-256 de21d70e9a5e9377…

MALICIOUS

PDF

77.5 KB Created: 2021-09-04 14:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 03357a1a8bd26878dd99bcefd461910d SHA-1: af9a606faa3f0bef92e9c09a38b83eb2273bc0a7 SHA-256: de21d70e9a5e9377bde255bff52f77d00fea496dd6971956ba6c3ad41cf930e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farms indicates an attempt to lead the user to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://inwebjor.ru/uplcv?utm_term=meningitis+viral+pdf PDF link annotation
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766935ee5f3---togobibetopudazeba.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/12475057069.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/opk6todbdsr2fl8ludvh4k9atf/45517764906.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/gifutufomuluw.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/03dqgclb1u7j5cgrvjrli5eae5/1836633513.pdfIn PDF document text
    • http://scantech3d.com/files/wasejebokuvukenusafasedo.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/bisidilelajinowe.pdfIn PDF document text
    • https://felicityokolo.com/file/6014934712.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/cpn0mcc3l6f4vq31vni2rkemu2/kekurizilovoxit.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16074810459972---56991219331.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/ikoapl1kcgpc1jnqp06bh0tlnb/xudapalasugudirimaxemi.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e75bf29745---32329668702.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/62136444410.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/3995917509.pdfIn PDF document text
    • http://tragadsonisurat.com/ckfinder/userfiles/files/zitimub.pdfIn PDF document text
    • http://mebco.ru/images/file/19520058988.pdfIn PDF document text
    • http://normel.org/files/upload/file/69471460853.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/50961422550.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/99044047651.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/dadb2c08e8ef197bc7f043bcaf8f5162/43521721421.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/sokaxusov.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/62aub46pm0cbdp5c1pg70uoro1/51991248842.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/xuronabavukug.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f015c38799---81542450515.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160975ef19dfca---lelaseralunutekumefebinez.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/ench62vfub6mug4vjlgukt0m75/beguve.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF05 16260 bytes
SHA-256: c3a116001b10fa766cd396c81429511fd6e9ce1266870787479bcf347b770569
font_01_sfnt_off0000f89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89A 10612 bytes
SHA-256: 288f0222e4262715f1c1fb9778928005e70f3d2e94fcc7372ff0023fea2c7283
font_02_sfnt_off000110ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1